核医学影像中的数据处理ppt课件.ppt

Image Registration PET CT PET/CT Voxel based image registration Image Registration Image Registration 算法流程图 相似性测量一般用到的函数有： 相同模态图像：残差（sum of square difference） 不同模态图像：互信息（mutual information） 一般用来做配准的优化算法有： 六参数或十二参数的优化一般使用 Powell 优化算法 多参数优化一般使用LBFGS（ limited-memory Broyden–Fletcher–Goldfarb–Shanno ）优化算法（由牛顿算法演变而来） Image Fusion Alpha Blending based Adaptive alpha blending Alpha blending Adaptive Alpha blending Outline Data organization Correction methods Rebinning Image reconstruction Image registration and fusion DICOM and PACS DICOM and PACS DICOM Digital image and Communication in Medicine Created by ACR (American College of Radiology) and NEMA (National Electrical Manufacturers Association) in 1985 Two components: Communication protocols and image format standards DICOM image VS. General image Structure: DICOM contains header and image data sections; Other image file such as BMP, JPG, TIFF, which contain also two sections; Size: The header size of DICOM is variable; The header size of many general image is constant Contents: DICOM contains additional patients’ data such as basic information, study information and so on; General image header describes basic image parameters, such as image size, compression type DICOM logical layers Patient information: Patient’s name, patient’s ID, patient’s birth date, hospital information system Study information: Study information such as dose, injection time and additional examination information such as study name study date; Series information: Series ID, manufacturer and institution name Image information: The size of pixel, image size, pixel value and how it is encoded PACS PACS The Picture Archival and Communication System A system for storage of images and transferring images between computers in different facilities through networks PACS is helpful to provide comparative studies among different image modalities PACS (con) Thanks Our Group is growing up TOF-PET TOF信息 PET原始数据 偶然符合校正 发射图像 衰变校正 死时间校正 弓形几何校正